Melting furnace



Nov. 19, 1957 o. c. KUEHNE 2,813,707 I MELTING FURNACE Filed July 13,1953 2 Sheets-Sheet 1 INVENTOR ATTORNEYS MELTING FURNACE Oscar C. Kuehne, San Antonio, Tex. Application July 13, 1953, Serial No. 367,464

1 Claim. (Cl. 263-11) This invention relates to a melting furnace and is an improvement over the burner structure embodied in my prior Patent 2,521,584, issued September 5, 1950.

An object of this invention is to provide an improved gflting furnace for soft metals such as lead, Babbitt or the Another object of this invention is to provide an improved furnace structure wherein the burner is designed for burning various types of gas and includes means for mixing air with the gas so as to provide the necessary high temperature for melting relatively soft metals or the With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claim.

In the drawings:

Figure 1 is a detailed top plan view of a melting furnace constructed according to an embodiment of this invention.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a fragmentary bottom plan of the burner structure.

Figure 4 is a fragmentary sectional view taken on the line 4-4 of Figure 2.

Figure 5 is a plan view of the multi-jet.

Referring to the drawings, the numeral designates generally a furnace housing which is formed of a cylindrical side wall 11 having a plurality of legs 13 disposed at the lower end thereof, so as to dispose the lower edge 12 of the housing 11 above the surface on which the legs engage and thereby permit the entrance of air beneath the lower edge of housing 11. The housing 11 has fixedly disposed on the interior thereof a plurality of radially disposed walls 14 which are provided with upper shoulders 15 forming a seat on which a pot 16 is adapted to rest.

The upper portions of the walls 15 flair outwardly and upwardly as indicated at 17 so that the pot 16 may sit downwardly into the interior of the housing 11 for a substantial distance. The walls 14 are provided with upwardly and inwardly inclined lower portions 18 and an upwardly tapering burner head 19 is fixed to the tapering wall portion 18 and is preferably formed integral therewith. The head 19 has fixed to and extending inwardly from the upper end thereof, a top wall 20 which is formed with a plurality of elongated openings 21. A plurality of bracing ribs 22 are connected between the head member 19 and the inner tapering throat member 23. Throat member 23 tapers reversely from the taper of head mem ber 19, having its larger end uppermost. A multi-jet member 24 which is formed with a flat top wall 25 is tightly secured against the lower end of throat member 23 by means of an upwardly projecting bolt 26, which extends from the top wall 25 and projects through a hori- 2,13,707 Patented Nov. 19, 1957 zontal wall 27 formed integral with the inner throat member 23. A nut 28 is threaded on bolt 26 and locks bolt 26 relative to top wall 25, and a nut 29 is threaded on bolt 26 for securing jet 24 to the lower end of inner throat member 26. The jet 24 is provided with a downwardly and upwardly inclined wall 30 which is formed with a plurality of fuel discharge or jet openings 31.

Multi-jet 24 is held against turning with respect to the inner throat member 23 by means of an upwardly projecting lug 32 which is carried by the top wa1l25 of multijet 24, and the lug 32 engages in a selected one of a plurality of keeper recesses 33 which are formed in the lower portion of the inner throat member 23. The jet 24 has fixed to the lower side thereof, an internally threaded nut member 34 which is adapted by means of a coupling member 35 to be connected to a fuel supply pipe 36.

In the use and operation of this melting furnace, the jet 24 is connected by the pipe 36 to a source of fuel supply, such as gas or the like. The furnace body 11 is supported on a horizontal plane or surface and the jet 24 is fixed within the burner head 19 The gas discharged from the openings 31 will pass upwardly through the upwardly tapering passage 37 and through the openings 21. The ignited fuel will contact with the bottom of the pot 16 and will extend about the sides of the pot as the heat rises upwardly. The inwardly projecting radial walls 14 of the housing 11 will provide vertical passages for the products of combustion, so that in the event the furnace is setting in a draft of air the heat and products of combustion will not be blown to one side of the pot 16.

What is claimed is:

A melting furnace comprising a cylindrical housing having a vertically disposed axis, a plurality of legs integrally depending from the lower end of said housing, a plurality of radial walls integrally formed on said housing extending inwardly thereof, a frusto-conical throat member coaxially arranged within the lower portion of said housing integrally carried by the inner edges of said radial walls, said throat member tapering upwardly and inwardly, a frusto-conical inner throat member coaxially arranged within the upper portion of said throat member and terminating at its upper edge in a line with the upper edge of said throat member, said inner throat member terminating at its lower edge substantially above the lower edge of said throat member, said inner throat member tapering outwardly and upwardly, a plurality of radial connector walls extending between and integrally joined to said throat member and said inner throat member, a horizontal wall integrally formed in said inner throat member adjacent to but spaced above the lower edge thereof, a multi-jet burner member, and means securing said burner member to said horizontal wall with said burner member in engagement with the lower end of said inner throat completely within said throat.

References Cited in the file of this patent UNITED STATES PATENTS 1,121,957 Vergnani Dec. 22, 1914 1,861,138 Ryan May 31, 1932 2,022,372 Hopkins Nov. 26, 1935 2,097,637 Osolin Nov. 2, 1937 2,152,446 Temple Mar. 28, 1939 2,661,056 Kuehne Dec. 1, 1953 FOREIGN PATENTS 19,601 Great Britain May 7, 1898 16,325 Germany Dec. 10, 1881 328,173 Germany Oct. 25, 1920 417,405 France Aug. 30, 1910 511,186 France Sept. 20, 1920 

